America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

The 28,000-year-old specimen is remarkably intact.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

An overlooked memorial honoring the local Washington residents who died in World War I.

Look closely and you’ll notice that the color changes a third of the way up the tower.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A super-sized promotional trick that is now a D.C. landmark.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A historic neighborhood church is reborn as a psychedelic arts collective.

The site of the climactic scene from the classic horror film is now a historic landmark.

At 207 feet, one of the world's longest continuous escalators.

Ancient snack bar of the Roman Empire re-opened.

This monumental fountain has moved around the city multiple times.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

An eerie, little-known Neapolitan museum filled with preserved human remains.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.